File operations with folders in path - pre-merged

[statnmap]

Set a first pre-merge of https://github.com/ThinkR-open/gitlabr/pull/74 to retrieve all modifications previously merged in main.

• [x] Verify that group operations are working as expected
• [ ] Verify consistency with file_path handling : #111
• [ ] Verify that file operations are working
• [ ] Add Missing topics: gl_get_group_id, gl_group_req, gl_list_groups, gl_new_group in _pkgdown.yml
• [ ] Add new features in vignettes
• [ ] Close https://github.com/ThinkR-open/gitlabr/pull/74
• [ ] Bump to 2.1.0